Abstract
Car manufacturers are considering a shift of battery voltage from 12 V to 48 V with beneficial effects on both weight and cost of copper cables. This emerging scenario requires high-efficiency, high step-down converters for supplying the various electronic loads aboard. The series capacitor tapped inductor converter (SCTI) is a promising topology, but its synchronous version suffers from large voltage spiking across the low-voltage switch whenever ZVS commutation for the synchronous rectifier is not satisfied during transient events. In this paper a simple lossless snubber based on an auxiliary winding is proposed, which ensures reliable operation by preventing such spike to occur. Considerations about the effect of auxiliary winding parasitic inductance are made and the approach is validated through computer simulations.
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